Question

我正在获得这样的NSMutableArray，

Selected Id : (
    2,
    92,
    154
)

它不是静态的，当我选择多个表视图行时会添加这些值。

目前我选择了3行，其ID在该数组中打印，如果我再选择一行，即4行，那么数组将是这样的

Slected Id : (
    2,
    92,
    154,
    12
)

如果我取消选择任何行，假设我取消选择2行，那么新数组将是

Slected Id : (

    154,
    12
)

所以，我想将这些值存储在任何会给我输出的对象中，

154,12

即用逗号分隔的对象

我选择了5个值，它必须像这样存储

6,87,154,65,45

如何实施？

我的项目代码：

    - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{

         self.selectedPath = indexPath;

        if ([tableView isEditing]) {

            //  [selectedArray addObject:[_mutableArray objectAtIndex:indexPath.row]];

            [selectedArray addObject:[[_mutableArray objectAtIndex:indexPath.row] valueForKey:@"c_uid"]];

            count1=(int)[selectedArray count];
            NSLog(@"Selected count is :%i",count1);
            NSLog(@"Slected Id : %@",selectedArray);


        }else{

         /// other action
    }

-(void)tableView:(UITableView *)tableView didDeselectRowAtIndexPath:(NSIndexPath *)indexPath {

    self.selectedPath = indexPath;


 //   [selectedArray removeObject:[_mutableArray objectAtIndex:indexPath.row]];
    [selectedArray removeObject:[[_mutableArray objectAtIndex:indexPath.row] valueForKey:@"c_uid"]];

    count1=(int)[selectedArray count];
    NSLog(@"Selected count is :%i",count1);
    NSLog(@"Slected Id : %@",selectedArray);



    if (!selectedArray.count) {
        [self.tableView setEditing:NO animated:YES];
    }
}

在这里，我将获得所选数据，

NSLog(@"Slected Id : %@",selectedArray);

Answer 1

为此，您应该使用以下UITableView的委托方法，

override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath){
  //your code...      
 }

现在通过采用一个可变数组来管理选择和取消选择行ID，如下所示

var selectedRowArr = [String]() // Change if your id is Int or other type.

现在您需要更新上面的代理方法，如下所示

 override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath){
     //your code...

     // First check "rowId" already added or not
     if selectedRowArr.contain(rowId){ // make sure "rowId" is same type of array 
        selectedRowArr = selectedRowArr.filter { $0 != rowId as! String } // remove object from array list
      }
      else {
          selectedRowArr.append(rowID)
      }
 }

将数组转换为字符串

let myString = selectedRowArr.joined(separator: ",")

输出应为

<强> 1,12,13

更新：

首先删除didDeselectRowAtIndexPath方法我将修改您的didSelectRowAtIndexPath方法

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{

         self.selectedPath = indexPath;

        if ([tableView isEditing]) {

            First you need to check "c_uid" is already added in the Array or not ?
            if ([selectedArray containsObject:someObject]) {
              [selectedArray removeObject:[[_mutableArray objectAtIndex:indexPath.row] valueForKey:@"c_uid"]];

                count1=(int)[selectedArray count];
              NSLog(@"Selected count is :%i",count1);
                 NSLog(@"Slected Id : %@",selectedArray);



                   if (!selectedArray.count) {
                     [self.tableView setEditing:NO animated:YES];
                    }
            }
            else {
               [selectedArray addObject:[[_mutableArray objectAtIndex:indexPath.row] valueForKey:@"c_uid"]];

               count1=(int)[selectedArray count];
               NSLog(@"Selected count is :%i",count1);
               NSLog(@"Slected Id : %@",selectedArray);
            }


        }else{

         /// other action
    }

如果要将数组转换为字符串，则

NSString * result = [selectedArray componentsJoinedByString:@","];

输出应为

<强> 1,12,13

Answer 2

希望以下代码对您有所帮助！

NSMutableString *strProductId = [[NSMutableString alloc]init];
[strProductId setString:@""];
NSArray *arrTemp =  [selectedArray copy];
for (int i=0; i<[arrTemp count]; i++)
{
    if ([arrTemp count]-1 == i)
    {
        [strProductId appendFormat:@"%@",[arrTemp objectAtIndex:i]];
    }
    else
    {
        [strProductId appendFormat:@"%@,",[arrTemp objectAtIndex:i]];
    }
}

NSLog(@"Selected Id : %@",strProductId);

输出可能是！

所选标识：6,87,154,65,45

如何将值从NSMutableArray存储到字符串？

2 个答案: